n. [ L. alumen, aluminis. See Alum. ] (Chem.) One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3. [ 1913 Webster ]

☞ It is the oxide of the metal aluminium, the base of aluminous salts, a constituent of a large part of the earthy siliceous minerals, as the feldspars, micas, scapolites, etc., and the characterizing ingredient of common clay, in which it exists as an impure silicate with water, resulting from the decomposition of other aluminous minerals. In its natural state, it is the mineral corundum. [ 1913 Webster ]

n. (Chem.) A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen. [ 1913 Webster ]

a. Combined with alumina. [ 1913 Webster ]

n. [ F. ] Alumina. Davy. [ 1913 Webster ]

a. Of or containing aluminium; as, aluminic phosphate. [ 1913 Webster ]

a. [ L. alumen alum + -ferous: cf. F. aluminifère. ] Containing alum. [ 1913 Webster ]

a. [ L. alumen + -form. ] Having the form of alumina. [ 1913 Webster ]

n. [ L. alumen. See Alum. ] (Chem.) same as aluminum, chiefly British in usage. [ 1913 Webster ]

Aluminium bronze or
gold, a pale gold-colored alloy of aluminium and copper, used for journal bearings, etc. [ 1913 Webster ]

v. t. To treat or impregnate with alum; to alum. [ 1913 Webster ]

n. [ Alumin-ium + -graphy. ] Art or process of producing, and printing from, aluminium plates, after the manner of ordinary lithography. -- A*lu`mi*no*graph"ic a. [Webster 1913 Suppl.]